Kazumoto TanakaTakayuki KataokaMakoto HasegawaVirtual Sport System for Optimum Exercising Based on a User Model.283-2902009Edutainmenthttp://dx.doi.org/10.1007/978-3-642-03364-3_34conf/edutainment/2009db/conf/edutainment/edutainment2009.html#TanakaKH09